JP3579839B2 - Mold for manufacturing molded article and manufacturing method - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold and a method for manufacturing a molded product applicable to a wide range of fields from automobile parts, electric product parts, medical equipment parts, sports equipment and tools, toys, daily necessities and the like.
[0002]
[Prior art]
Molded products used in this type of field are generally provided with a rubber at least partially including the outer peripheral portion of the surface of the molded product body made of ABS resin or the like for the purpose of preventing damage when dropped and preventing slippage. It is configured by fusing a buffer layer such as an elastomer, which is an elastic body.
[0003]
One example of this type of conventional molded product is shown in FIG. In the figure, reference numeral 1 denotes a molded article main body which is primarily molded with an ABS resin, and 2 denotes an elastomer buffer layer which is secondarily molded on the surface (cavity). The manufacturing method of the molded article 3 described with reference to FIG.
[0004]
When molding the molded article main body 1, as shown in FIG. 5A, a cavity plate 5 for primary molding is superimposed on a core plate 4 for inner (core) shape molding, and is formed by the two plates 4, 5. The primary molding is performed by injecting an ABS resin into the gap. Thereby, the molded article main body 1 is molded.
[0005]
Next, when the buffer layer 2 is molded on the surface of the molded article main body 1 , the cavity plate 6 for secondary molding is stacked on the core plate 4 instead of the cavity plate 5 as shown in FIG. Secondary molding is performed by injecting an elastomer into a gap between the inside of the cavity plate 6 and the molded article main body 1 on the core plate 4. Thereby, the molded product 3 is obtained.
[0006]
Next, a manufacturing process using an actual mold for performing this molding will be described with reference to FIG.
[0007]
In FIG. 6, 7 is a push-off plate, 8 is a cam, 9 is a push-down pin, 10 is a push-up pin, and 11 is a push-off pin. Reference numerals 4 and 5, 6 denote a core plate and a cavity plate indicated by the same reference numerals as in FIG. 5, and FIG. 5 shows a schematic cross-sectional configuration .
[0008]
First, the step of primary molding will be described with reference to FIG. At the time of primary molding (corresponding to FIG. 5A), the push-up pin 10 is pushed down by the cavity plate 5, and the cam 8 is positioned by the push-up pin 10 in the state of FIG. The pin 11 is pushed up, and the ABS resin is injected into the gap in this state. In this case, a hole by the push-off pin 11 is formed in the molded article main body 1.
[0009]
At the time of secondary molding (corresponding to FIG. 5B), the pressing pin 9 is pressed by the cavity plate 6, and the cam 8 is positioned at the state of FIG. 6B. At this time, the push-up pins 10 protrude from the upper surface of the core plate 4. In this state, the push-off plate 7 is also lowered together with the push-down pin 9, a gap of the gap d is secured on the surface of the molded article main body 1, and the elastomer is injected into the gap to perform the secondary molding.
[0010]
[Problems to be solved by the invention]
However, in the above-described molding process, an elastomer buffer layer cannot be formed on the lower surface (surface A in FIG. 4) of the outer periphery of the molded product, and the effects of preventing damage and preventing slippage can be completely achieved. Did not. Further, the load is concentrated on the contact portion between the cam 8 and the push-off plate 7 and the push-up pin 10 in FIG.
[0011]
In addition, when the molded article on which the buffer layer is formed as described above is used by being attached to a housing on the side of the electric appliance main body, depending on the application, a surface for attaching the molded article to the casing (FIG. 4). It is necessary to attach a waterproof packing to the (A side), which requires extra man-hours, increases the number of parts, and increases the cost.
[0012]
SUMMARY OF THE INVENTION An object of the present invention is to provide a mold for manufacturing a molded article and a method for producing the molded article, which can easily produce a molded article in which a buffer layer is integrally fused to the surface and the inside of the molded article body.
[0013]
[Means for Solving the Problems]
The mold for manufacturing a molded article according to the present invention has a first mold part, a second mold part and a third mold part combined with the first mold part, and the first mold part combined with the first mold part. In a mold for manufacturing a molded product in which a molding gap is formed between the mold portion and the second mold portion or between the first mold portion and the third mold portion, the first mold portion is disposed in a horizontal direction. And a core moving part that contacts at least a part of the inclined surface of the block part and moves in the vertical direction by moving the block part in the horizontal direction. A plurality of first movements that, when combined with a first mold part, form a gap for forming a first molded part, and move the block part in a direction in which the core moving part is pushed up. A third mold part, when combined with the first mold part, with respect to the first molded part. Forming a gap to form a second molding part, those and having a configuration with a plurality of second moving member is moved in a direction in which the core moving part is pushed down.
[0014]
Further, the method of manufacturing a molded article of the present invention is a method of manufacturing a molded article that combines a plurality of mold parts and molds the molded article using a molded article molding gap formed between the plurality of mold parts . A first mold part having a core moving part that is vertically moved by a horizontally movable block part, and a plurality of first moving members that move the block part in a direction in which the core moving part is pushed up. The first forming part is formed in a state where the core moving part is pushed up by the first moving member, and the first mold part and the core moving part are pressed in a direction in which the core moving part is pushed down. Combining with a third mold part having a plurality of second moving members to be moved, and placing the second forming part on the first forming part in a state where the core moving part is pushed down by the second moving member. It has a molding process.
[0015]
[Action]
At the time of molding a molded product, the second mold portion is opposed to the first mold portion and lowered to close the mold. At this time, the block part movable in the horizontal direction is moved by the first moving member, and the core moving part is pushed up. As a result, a gap for molding the first molded section is formed between the first mold section and the second mold section, and the first molded section is molded by injecting an ABS resin or the like into the gap. Is done.
[0016]
Thereafter, when the second mold part is raised, the first molded part remains on the second mold part. Next, a second molded part is molded on the first molded part. In molding the second molded part, the third mold part is opposed to the first mold part and lowered. Perform mold clamping. At this time, the second moving member presses the core moving unit to lower it by a predetermined amount. As a result, a gap for molding the second molded portion is formed between the two mold portions. A molded product can be produced by injecting an elastomer or the like into the gap and fusing the second molded portion to a predetermined portion of the first molded portion.
[0017]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIGS. 1A and 1B are diagrams showing a manufacturing process of a molded article according to a first embodiment of the present invention. FIG. 1A shows a primary molding state in which a molded article main body (first molded portion) 101 is molded, and FIG. (C) shows a secondary molding state in which first and second buffer layers (second molding parts) 102 and 103 are simultaneously molded on the surface and inside of the molded article main body 101. . Reference numeral 21 denotes a production mold (hereinafter simply referred to as a mold) used for molding, and its configuration is as follows.
[0018]
The mold 21 includes a first cavity plate (second mold part) 22 for primary molding, a second cavity plate (third mold part) 23 for secondary molding, and a common primary and secondary molding. A configuration including the core plate 24, the push-up block (block portion) 25, and the core back piece (core moving section) 26, and the configuration including the push-up block 25 and the core back piece 26 constitutes a first mold portion 72. The first cavity plate 22 is a movable member including a first concave portion 27 for molding the surface shape of the molded article main body 101 and a first engaging portion 28 having an inclined surface.
[0019]
The second cavity plate 23 has a second concave portion 29 for forming a first buffer layer on the surface of the molded article main body 101 and a pressing pin (second pin) for pressing and lowering the core back piece 26 at the time of secondary molding. (A moving member) 30.
[0020]
The core plate 24 is formed by mounting a convex portion 31 for forming an inner shape of a molded product main body 101 on a substrate 32. The push-up block 25 has a second engaging portion 33 having an inclined surface capable of engaging with the first engaging portion 28 and a third engaging portion 34 having an inclined surface. It is supported so that it can move forward and backward.
[0021]
The core back piece 26 has a fourth engaging portion 35 having an inclined surface capable of engaging with the third engaging portion 34, and is fitted on the outer periphery of the convex portion 31 so as to be vertically movable.
[0022]
Next, the molding of the molded article main body 101 (primary molding) using this mold and the simultaneous molding (secondary molding) of the first and second buffer films on the surface and inside of the molded article main body 101 will be described. A detailed description will be given while supplementing the configuration.
[0023]
In the primary molding, as shown in FIG. 1A, the first concave portion 27 is opposed to the convex portion 31 and the first cavity plate 22 is pushed down until the lower surface contacts the upper surface of the push-up block 25 (driving means). Is not shown). At the time of this pressing down (mold clamping), the first and second engaging portions are engaged, and the push-up block 25 moves in the horizontal direction toward the convex portion 31 as shown by an arrow. The plurality of angular pins (first moving members) 36 provided in the first cavity plate 22 and parallel to the first engagement portions 28 are provided with holes 37 formed in the push-up block 25 correspondingly. To help the push-up block 25 advance in the direction indicated by the horizontal arrow.
[0024]
As the push-up block 25 advances, the third engagement portion 34 on the push-up block 25 side and the fourth engagement portion 35 on the core-back piece 26 are engaged, and the core-back piece 26 rises in the direction of the arrow to the upper end. Comes into contact with the lower surface of the first cavity plate 22, and preparation for the primary molding is completed. In this state, a gap 38 necessary for molding the molded article main body is formed between the first concave portion 27 and the convex portion 31, and the lower end of the gap 38 is closed by the upper end 39 of the core back piece 26. A gap a is formed between the lower end 41 of the core back piece 26 and the upper surface of the substrate 32, as shown in detail in FIG.
[0025]
Therefore, by injecting (primary molding) the ABS resin or the like into the gap 38 in this state, the molded article main body 101 as the first molded portion can be obtained. Reference numeral 40 denotes an injection port of an ABS resin or the like. When the primary molding is completed, the mold is opened as shown in FIG. 1B, and the process proceeds to the next secondary molding. When the mold is opened, the molded article main body 101 remains on the projection 31. Further, the push-up block 25 is retracted in the direction indicated by the horizontal arrow as the hole 37 and the angular pin 36 engage with each other and the angular pin 36 moves upward.
[0026]
In the secondary molding, as shown in FIG. 1C, the second concave portion 29 is opposed to the convex portion 31, and the second cavity plate 23 is pushed down until the lower surface contacts the upper surface of the push-up block 25. At the time of this pressing down (mold clamping), the pressing pin 30 pushes down the core back piece 26 until the lower end 41 contacts the upper surface of the substrate 32. At this time, since the push-up block 25 is sufficiently retracted as described above, the third and fourth engagement portions 34 and 35 are not engaged, and the lowering of the core back piece 26 is not hindered.
[0027]
The lowering amount of the core back piece 26 at this time is an amount corresponding to the gap a shown in FIGS. 1A and 2, and by this lowering, the lower surface of the second cavity plate 23 and the upper end of the core back piece 26 39, a gap 44 for forming the second buffer layer 103 is formed. The outer periphery of the gap 44 is closed by a projection 42 provided on the second cavity plate 23, and the gap 44 is sealed. Is done.
[0028]
As a result, a gap 43 required for molding the first buffer layer 102 is formed between the molded article 101 on the convex section 31 and the second concave section 29, and the second section is formed at the bottom of the molded article 101. The gap 44 necessary for molding the buffer layer 103 is formed.
[0029]
Therefore, by injecting (secondary molding) an elastomer or the like into the gaps 43 and 44, the first buffer layer 102 and the second buffer layer 103, which are the second molded portions, can be simultaneously fused. . The illustration of the injection port communicating with the gaps 43 and 44 is omitted. The first buffer layer and the second buffer layer may be made of the same material or different materials. In the case of the same material, each color can be changed. Also a molded article 101 by the primary molding the secondary molding by the molded product (the buffer layer 102, 103), as described above, the relatively high strength of various resins such as ABS resin, having a relatively elastic like Various soft resins can be selected and used depending on the application. In the primary molding and the secondary molding, it is also possible to use resins of the same material and different colors.
[0030]
3A and 3B show a manufacturing process diagram of a molded article according to a second embodiment of the present invention, wherein FIG. 3A shows a primary molding state in which a molded article main body (first molded portion) 104 is molded, and FIG. (C) shows a secondary molding state in which first and second buffer layers (second molding parts) 105 and 106 are simultaneously molded on the surface and the inside of the molded article main body 104. And 51 is a mold used for molding, and the structure thereof will be described below.
[0031]
The mold 51 includes a first cavity plate (second mold portion) 52 for primary molding, a second cavity plate (third mold portion) 53 for secondary molding, and a core shared by primary and secondary molding. The first cavity plate 52 includes a plate 54, a push-up block (block portion) 55, and a core back piece (core moving portion) 56. The first cavity plate 52 has a first concave portion 57 for forming the surface shape of the molded article main body 104 and a first concave portion 57. And a movable member provided with the engaging portion 58 of FIG. The push-up block 55 and the core back piece 56 constitute a first mold portion 73.
[0032]
The second cavity plate 53 has a second concave portion 59 for forming a first buffer layer on the surface of the molded article main body 104 and a pressing pin (second pin) for pressing and lowering the core back piece 56 at the time of secondary molding. Of the movable side).
[0033]
The core plate 54 is formed by mounting a pin-shaped convex portion 61 on a substrate 62. The push-up block 55 is capable of engaging with the second engaging portion 63 capable of engaging with the first engaging portion 58 of the first cavity plate 52 and the fourth engaging portion 63 of the core back piece 56. And a third engaging portion 64, which is supported by the substrate 62 so as to be able to advance and retreat toward the convex portion 61. The core back piece 56 has a fourth engaging portion 65 engageable with the third engaging portion 64, and is fitted to the outer periphery of the convex portion 61 so as to be vertically movable. Reference numerals 67 and 68 denote a plurality of angular pins (first moving members) and holes similar to those in the previous example .
[0034]
Next, the primary molding of the molded article main body 104 by this mold and the secondary molding of the first and second buffer layers on the surface and inside of the molded article main body 104 will be described while supplementing the constitution. The operation of each part is almost the same as that of the previous example, and therefore, parts different from the previous example will be mainly described.
[0035]
During the primary molding, as shown in FIG. 3A, the first cavity plate 52 is pushed down (the mold is closed). Due to the engagement of the respective engaging portions at the time of the depression, the core back piece 56 is raised until the upper end thereof is aligned with the upper end of the convex portion 61. At this time, the outer peripheral portion of the upper end of the core back piece 56 engages with the peripheral wall of the first concave portion 57. In this state, a gap 66 necessary for molding the molded product body is formed between the bottom surface of the first concave portion 57, the convex portion 61, and the upper end of the core back piece 56.
[0036]
In this state, the molded product main body 104 as the first molded portion can be obtained by injecting (primary molding) an ABS resin or the like into the gap 66. In this state, a gap b exists between the lower end of the core back piece 56 and the upper surface of the substrate 62. When the primary molding is completed, the mold is opened as shown in FIG. 3B, and the process proceeds to the next secondary molding.
[0037]
During the secondary molding, the second cavity plate 53 is pushed down as shown in FIG. Due to this depression, the core back piece 56 is pushed down by an amount corresponding to the gap b by the pressing pin 60 and is locked to the substrate 62, and is located between the peripheral wall of the second recess 59 and the outer periphery of the tip of the core back piece 56. A gap 69 necessary for forming the first buffer layer 105 is provided between the inside of the molded article 104 on the convex portion 61 and the upper end surface of the core back piece 56. Are formed respectively.
[0038]
At this time, the gap 69 is sealed with the lower end closed by the projection 71 provided on the second cavity plate 53. In this state, by injecting (secondary molding) an elastomer or the like into the gaps 69 and 70, the first and second buffer layers as the second molded portions are formed with respect to the molded product 104 as the first molded portion. 105 and 106 can be fused at the same time. Note that the formation range of the second buffer layer 106 can be freely set by changing the diameter of the projection 61.
[0039]
【The invention's effect】
According to the present invention, the following various excellent effects can be obtained.
(1) A buffer layer (second molded portion) and the like can be simultaneously molded on desired portions of the surface and inside of the molded article main body (first molded portion) molded by the primary processing.
(2) When the molded article is to be attached to the casing on the device main body side, the inner buffer layer can be configured to play a role of packing. Therefore, a sufficient waterproof effect can be obtained without separately preparing a packing at the time of assembly.
(3) The molding of the molded article main body and the first and second buffer layers can be performed continuously by using a common mold only by changing a part of the molds in the primary and secondary moldings. Reduction of manufacturing process and reduction of mold manufacturing cost are realized.
(4) By making the engagement between the push-up block of the mold and the core moving portion in surface contact, the concentration of the load, which has conventionally been a problem, can be eliminated, which is advantageous in strength.
[Brief description of the drawings]
FIGS. 1A and 1B are manufacturing process diagrams of a molded article according to a first embodiment of the present invention, wherein FIG. 1A shows a primary molding state, FIG. 1B shows a mold opening state after the primary molding, and FIG. Each molding state is shown.
FIG. 2 is a detailed view of a main part of FIG. 1 (A).
3A and 3B are manufacturing process diagrams of a molded article according to a second embodiment of the present invention, wherein FIG. 3A is a primary molding state, FIG. 3B is a mold opening state after the primary molding, and FIG. Each molding state is shown.
FIG. 4 is a cross-sectional view of a conventional molded product.
5A and 5B are explanatory diagrams of a method of manufacturing the molded article of FIG. 4, wherein FIG. 5A shows a primary molding state and FIG. 5B shows a secondary molding state.
6A and 6B are manufacturing process diagrams of the molded article in FIG. 4, wherein FIG. 6A shows a primary molding state and FIG. 6B shows a secondary molding state.
[Explanation of symbols]
21, 51 Mold 22, 52 First cavity plate (second mold part)
23, 53 Second cavity plate (third mold part)
25, 55 Push-up block (block part)
26,56 core back piece (core moving part)
27, 57 First concave portion 28, 58 First engaging portion 29, 59 Second concave portion 30, 60 Press pin (second moving member)
31, 61 Convex part 33, 63 Second engaging part 34, 64 Third engaging part 35, 65 Fourth engaging part 36, 67 Angular pin (first moving member)
38, 43, 44, 66, 69, 70 Gaps 72, 73 First mold part 101, 104 Molded product body (first molded part)
102,105 First buffer layer (second molded part)
103, 106 Second buffer layer (second molded part)

Claims (2)

A first mold part, a second mold part and a third mold part combined with the first mold part, wherein the first mold part and the second mold part combined with each other or In a mold for manufacturing a molded product, a molding gap is formed between the first mold portion and the third mold portion, respectively.
The first mold part has a block part movable in a horizontal direction, and a core movement which contacts at least a part of the inclined surface of the block part and is moved in the vertical direction by the horizontal movement of the block part. Department and
The second mold portion forms a gap for forming a first molded portion when combined with the first mold portion, and moves the block portion in a direction in which the core moving portion is pushed up. A plurality of first moving members for causing
The third mold portion, when combined with the first mold portion, forms a gap for forming the second molded portion with respect to the first molded portion, and the core moving portion pushes down. A mold for manufacturing a molded product, comprising: a plurality of second moving members for moving in a predetermined direction. Combining a plurality of mold parts, in a method of manufacturing a molded article by molding a molded article using a molded article molding gap formed between the plurality of mold parts,
A first mold part having a core moving part vertically moved by a horizontally movable block part, and a plurality of first movements for moving the block part in a direction in which the core moving part is pushed up. Combining with a second mold part having a member, forming a first forming part in a state where the core moving part is pushed up by the first moving member,
Said first mold portion, combining the said third mold part the core moving unit including a plurality of second moving member that moves in a direction to be pushed down, the core mobile unit by the second moving member A method of manufacturing a molded product, comprising a step of molding a second molded part on the first molded part in a state where the molded part is pushed down.

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